When your handler is called , you can determine which control caused the event 在调用处理程序后,您可以确定哪个控件引发了事件。
The most common reason that a handler is not called is that the control has not been correctly bound to the event handler 未调用处理程序的最常见原因是控件尚未正确绑定到事件处理程序。
Configuration section . the asp . net infrastructure will then instantiate and call the handler when the corresponding request is received Asp . net结构在接收到相应请求后将实例化并调用处理程序。
This allows asp . net to call the handler to service requests made to resources with the file name extension that you want the http handler to process 这将允许asp . net调用处理程序,以处理对具有您希望http处理程序处理的文件扩展名的资源所发出的请求。
The debugger can break execution of your application immediately when an exception occurs , giving you a chance to debug the exception before a handler is invoked 调试器可以在发生异常时立即中断应用程序的执行,使您有机会在调用处理程序之前对异常进行调试。